[aerospace] Add helper functions from shell-common

aerospace/.config/shell-common/99_aerospace.sh

@@ -0,0 +1,8 @@
+# Aerospace specific shell configuration
+
+# Fuzzy find and focus a window using aerospace and fzf
+if [ -x "$(command -v aerospace)" ] && [ -x "$(command -v fzf)" ]; then
+    function ff() {
+        aerospace list-windows --all | fzf --height 40% --layout=reverse --border --ansi | awk '{print $1}' | xargs -I {} aerospace focus --window-id {}
+    }
+fi